An overwhelming majority (81 percent) of all respondents reported that they had tanned outdoors either frequently or occasionally in the past year. The study also showed that 32 percent of respondents had used a tanning bed in the past year, and of those women, one-fourth (25 percent) used a tanning bed at least weekly, on average. (Interestingly, another recent survey of 116 U.S. cities found an average of 42 tanning salons per city, which means they're more prevalent than Starbucks or McDonald's.)

So, if you or your friends need to be scared into giving up a bad tanning habit, here are some terrifying statistics: Studies show that indoor tanning increases a person's risk of melanoma by 75 percent. Women aged 15 to 29 are more likely than men to be diagnosed with melanoma—the deadliest form of skin cancer—and at current rates, one in five Americans will develop skin cancer in their lifetime.